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Research articles

ScienceAsia 47 (2021): 330-339 |doi: 10.2306/scienceasia1513-1874.2021.046

Development of chitosan beads as an oil adsorbent and its application in household grease traps

Rawinipa Srimoona,*, Jakkapan Potipatb

ABSTRACT:     The purpose of this research was to develop chitosan beads as an oil adsorbent in household grease traps. The results showed that chitosan beads, synthesized from 3% w/v chitosan flakes in 5% v/v acetic acid and formed the beads in 2.0 M NaOH, provided the best characteristics. The white colored beads were slightly hard with maximum average weight and maximum diameter of 0.0925±0.0101 g and 0.67±0.06 cm. respectively. SEM images revealed that the beads had spherical shapes and homogenously distributed pores. The maximum adsorption capacity was 1667.93±39.61 mg/g (83.40±1.98%) at the optimum adsorbent dosage of 10 g/l, initial oil concentration 20 g/l, pH 5 and 303 K with 25 min of contact time. The adsorption was fitted to the Langmuir adsorption isotherm. Our results indicated that the adsorption was monolayer and chemisorption, and Cm increased with increasing temperature. The kinetic study was correlated with the pseudo-second order, and the intraparticle diffusion was the rate controlling step. The adsorption of oil in the household grease trap showed a significant decrease in Fat, Oil & Grease (FOG), Biochemical Oxygen Demand (BOD), and Chemical Oxygen Demand (COD crossbow for hunting) (p < 0.05), while the pH did not change. Also, oil removal in real wastewater was lower than synthetic oil-in-water due to the competition for the biding sites between oil and other compositions presented in wastewater and the formation of stable micelle droplets by the surfactant. Nevertheless, the values of oil concentration in the household wastewater were lower than the standard limit of domestic discharge in Thailand, whereas the values in the treated wastewater from a noodle shop were over the standard value.

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a Department of Applied Science and Biotechnology, Faculty of Agro-Industrial Technology, Rajamangala University of Technology Tawan-Ok, Chanthaburi Campus, Chanthaburi 22210 Thailand
b Department of Environmental Science, Faculty of Science and Technology, Rambhaibarni Rajabhat University, Chanthaburi 22000 Thailand

* Corresponding author, E-mail: rawinipa.srimoon@gmail.com

Received 19 Mar 2020, Accepted 7 Apr 2021